Factman,
The drive on 99% of 911 systems is 1.3:1 or less. I sometimes run them at 1:1 with a 3" pulley on the bottom and same on top, it helps nothing.
Tha factory VW used 1.6:1 on a TI engine, thats what my shroud uses also.
There were only a few TI DTMS made.
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Jake Raby
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